Here is a engine bay pic,I just put a cone filter on the end of the maf on the stock intake,and blocked off the resonator box on the intake..As far as header good luck,Im not sure if anyone even makes one for the 2600i,there was a guy on here making them,but I dont know what happened about that..I did also move my iat sensor from the intake manifold and put it in the intake pipe for a better reading of the incoming air,gives a little better throttle response..Not a whole lot you can do,but I think the 2600i is pretty good power wise compared to other 4cylinder trucks...